General view of technicians (left to right) Lois Nystrom, Rosemary Kirchman, and Helen Lyness using vacuum tube titrators to titrate aluminum in a Dow Chemical Company laboratory. In the titration process, a solution of unknown concentration is commonly added to a solution of known concentration to precipitate a reaction in order to find out more about the unknown substance.
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Dow Chemical Company. “Technicians Titrating Aluminum in Dow Chemical Company Laboratory,” 1944. Dow Chemical Company Historical Image Collection, Box 7, Folder Plants--Main Laboratory (Old). Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/9880vr53k.
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